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| 1 | <?php |
| 2 | /** |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License as published by |
| 5 | * the Free Software Foundation; either version 2 of the License, or |
| 6 | * (at your option) any later version. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along |
| 14 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 16 | * http://www.gnu.org/copyleft/gpl.html |
| 17 | * |
| 18 | * @file |
| 19 | */ |
| 20 | |
| 21 | use Liuggio\StatsdClient\Factory\StatsdDataFactoryInterface; |
| 22 | use MediaWiki\Cache\LinkCache; |
| 23 | use MediaWiki\Config\ServiceOptions; |
| 24 | use MediaWiki\Deferred\DeferredUpdates; |
| 25 | use MediaWiki\Http\Telemetry; |
| 26 | use MediaWiki\MainConfigNames; |
| 27 | use Psr\Log\LoggerInterface; |
| 28 | use Wikimedia\Rdbms\DBConnectionError; |
| 29 | use Wikimedia\Rdbms\DBReadOnlyError; |
| 30 | use Wikimedia\Rdbms\ILBFactory; |
| 31 | use Wikimedia\Rdbms\ReadOnlyMode; |
| 32 | |
| 33 | /** |
| 34 | * Job queue runner utility methods. |
| 35 | * |
| 36 | * @since 1.24 |
| 37 | * @ingroup JobQueue |
| 38 | */ |
| 39 | class JobRunner { |
| 40 | |
| 41 | /** |
| 42 | * @internal For use by ServiceWiring |
| 43 | */ |
| 44 | public const CONSTRUCTOR_OPTIONS = [ |
| 45 | MainConfigNames::JobBackoffThrottling, |
| 46 | MainConfigNames::JobClasses, |
| 47 | MainConfigNames::MaxJobDBWriteDuration, |
| 48 | MainConfigNames::TrxProfilerLimits, |
| 49 | ]; |
| 50 | |
| 51 | /** @var ServiceOptions */ |
| 52 | private $options; |
| 53 | |
| 54 | /** @var ILBFactory */ |
| 55 | private $lbFactory; |
| 56 | |
| 57 | /** @var JobQueueGroup */ |
| 58 | private $jobQueueGroup; |
| 59 | |
| 60 | /** @var ReadOnlyMode */ |
| 61 | private $readOnlyMode; |
| 62 | |
| 63 | /** @var LinkCache */ |
| 64 | private $linkCache; |
| 65 | |
| 66 | /** @var StatsdDataFactoryInterface */ |
| 67 | private $stats; |
| 68 | |
| 69 | /** @var callable|null Debug output handler */ |
| 70 | private $debug; |
| 71 | |
| 72 | /** @var LoggerInterface */ |
| 73 | private $logger; |
| 74 | |
| 75 | /** @var int Abort if more than this much DB lag is present */ |
| 76 | private const MAX_ALLOWED_LAG = 3; |
| 77 | /** @var int An appropriate timeout to balance lag avoidance and job progress */ |
| 78 | private const SYNC_TIMEOUT = self::MAX_ALLOWED_LAG; |
| 79 | /** @var float Check replica DB lag this many seconds */ |
| 80 | private const LAG_CHECK_PERIOD = 1.0; |
| 81 | /** @var int Seconds to back off a queue due to errors */ |
| 82 | private const ERROR_BACKOFF_TTL = 1; |
| 83 | /** @var int Seconds to back off a queue due to read-only errors */ |
| 84 | private const READONLY_BACKOFF_TTL = 30; |
| 85 | |
| 86 | /** |
| 87 | * @param callable $debug Optional debug output handler |
| 88 | */ |
| 89 | public function setDebugHandler( $debug ) { |
| 90 | $this->debug = $debug; |
| 91 | } |
| 92 | |
| 93 | /** |
| 94 | * @internal For use by ServiceWiring |
| 95 | * @param ServiceOptions $serviceOptions |
| 96 | * @param ILBFactory $lbFactory |
| 97 | * @param JobQueueGroup $jobQueueGroup The JobQueueGroup for this wiki |
| 98 | * @param ReadOnlyMode $readOnlyMode |
| 99 | * @param LinkCache $linkCache |
| 100 | * @param StatsdDataFactoryInterface $statsdDataFactory |
| 101 | * @param LoggerInterface $logger |
| 102 | */ |
| 103 | public function __construct( |
| 104 | ServiceOptions $serviceOptions, |
| 105 | ILBFactory $lbFactory, |
| 106 | JobQueueGroup $jobQueueGroup, |
| 107 | ReadOnlyMode $readOnlyMode, |
| 108 | LinkCache $linkCache, |
| 109 | StatsdDataFactoryInterface $statsdDataFactory, |
| 110 | LoggerInterface $logger |
| 111 | ) { |
| 112 | $serviceOptions->assertRequiredOptions( self::CONSTRUCTOR_OPTIONS ); |
| 113 | $this->options = $serviceOptions; |
| 114 | $this->lbFactory = $lbFactory; |
| 115 | $this->jobQueueGroup = $jobQueueGroup; |
| 116 | $this->readOnlyMode = $readOnlyMode; |
| 117 | $this->linkCache = $linkCache; |
| 118 | $this->stats = $statsdDataFactory; |
| 119 | $this->logger = $logger; |
| 120 | } |
| 121 | |
| 122 | /** |
| 123 | * Run jobs of the specified number/type for the specified time |
| 124 | * |
| 125 | * The response map has a 'job' field that lists status of each job, including: |
| 126 | * - type : the job/queue type |
| 127 | * - status : ok/failed |
| 128 | * - error : any error message string |
| 129 | * - time : the job run time in ms |
| 130 | * The response map also has: |
| 131 | * - backoffs : the (job/queue type => seconds) map of backoff times |
| 132 | * - elapsed : the total time spent running tasks in ms |
| 133 | * - reached : the reason the script finished, one of (none-ready, job-limit, time-limit, |
| 134 | * memory-limit, exception) |
| 135 | * |
| 136 | * This method outputs status information only if a debug handler was set. |
| 137 | * Any exceptions are caught and logged, but are not reported as output. |
| 138 | * |
| 139 | * @param array $options Map of parameters: |
| 140 | * - type : specified job/queue type (or false for the default types) |
| 141 | * - maxJobs : maximum number of jobs to run |
| 142 | * - maxTime : maximum time in seconds before stopping |
| 143 | * - throttle : whether to respect job backoff configuration |
| 144 | * @return array Summary response that can easily be JSON serialized |
| 145 | * @throws JobQueueError |
| 146 | */ |
| 147 | public function run( array $options ) { |
| 148 | $type = $options['type'] ?? false; |
| 149 | $maxJobs = $options['maxJobs'] ?? false; |
| 150 | $maxTime = $options['maxTime'] ?? false; |
| 151 | $throttle = $options['throttle'] ?? true; |
| 152 | |
| 153 | $jobClasses = $this->options->get( MainConfigNames::JobClasses ); |
| 154 | $profilerLimits = $this->options->get( MainConfigNames::TrxProfilerLimits ); |
| 155 | |
| 156 | $response = [ 'jobs' => [], 'reached' => 'none-ready' ]; |
| 157 | |
| 158 | if ( $type !== false && !isset( $jobClasses[$type] ) ) { |
| 159 | // Invalid job type specified |
| 160 | $response['reached'] = 'none-possible'; |
| 161 | return $response; |
| 162 | } |
| 163 | |
| 164 | if ( $this->readOnlyMode->isReadOnly() ) { |
| 165 | // Any jobs popped off the queue might fail to run and thus might end up lost |
| 166 | $response['reached'] = 'read-only'; |
| 167 | return $response; |
| 168 | } |
| 169 | |
| 170 | [ , $maxLag ] = $this->lbFactory->getMainLB()->getMaxLag(); |
| 171 | if ( $maxLag >= self::MAX_ALLOWED_LAG ) { |
| 172 | // DB lag is already too high; caller can immediately try other wikis if applicable |
| 173 | $response['reached'] = 'replica-lag-limit'; |
| 174 | return $response; |
| 175 | } |
| 176 | |
| 177 | // Narrow DB query expectations for this HTTP request |
| 178 | $this->lbFactory->getTransactionProfiler() |
| 179 | ->setExpectations( $profilerLimits['JobRunner'], __METHOD__ ); |
| 180 | |
| 181 | // Error out if an explicit DB transaction round is somehow active |
| 182 | if ( $this->lbFactory->hasTransactionRound() ) { |
| 183 | throw new LogicException( __METHOD__ . ' called with an active transaction round.' ); |
| 184 | } |
| 185 | |
| 186 | // Some jobs types should not run until a certain timestamp |
| 187 | $backoffs = []; // map of (type => UNIX expiry) |
| 188 | $backoffDeltas = []; // map of (type => seconds) |
| 189 | $wait = 'wait'; // block to read backoffs the first time |
| 190 | |
| 191 | $loopStartTime = microtime( true ); |
| 192 | $jobsPopped = 0; |
| 193 | $timeMsTotal = 0; |
| 194 | $lastSyncTime = 1; // initialize "last sync check timestamp" to "ages ago" |
| 195 | // Keep popping and running jobs until there are no more... |
| 196 | do { |
| 197 | // Sync the persistent backoffs with concurrent runners |
| 198 | $backoffs = $this->syncBackoffDeltas( $backoffs, $backoffDeltas, $wait ); |
| 199 | $backoffKeys = $throttle ? array_keys( $backoffs ) : []; |
| 200 | $wait = 'nowait'; // less important now |
| 201 | |
| 202 | if ( $type === false ) { |
| 203 | // Treat the default job type queues as a single queue and pop off a job |
| 204 | $job = $this->jobQueueGroup |
| 205 | ->pop( JobQueueGroup::TYPE_DEFAULT, JobQueueGroup::USE_CACHE, $backoffKeys ); |
| 206 | } else { |
| 207 | // Pop off a job from the specified job type queue unless the execution of |
| 208 | // that type of job is currently rate-limited by the back-off list |
| 209 | $job = in_array( $type, $backoffKeys ) ? false : $this->jobQueueGroup->pop( $type ); |
| 210 | } |
| 211 | |
| 212 | if ( $job ) { |
| 213 | ++$jobsPopped; |
| 214 | $jType = $job->getType(); |
| 215 | |
| 216 | // Back off of certain jobs for a while (for throttling and for errors) |
| 217 | $ttw = $this->getBackoffTimeToWait( $job ); |
| 218 | if ( $ttw > 0 ) { |
| 219 | // Always add the delta for other runners in case the time running the |
| 220 | // job negated the backoff for each individually but not collectively. |
| 221 | $backoffDeltas[$jType] = ( $backoffDeltas[$jType] ?? 0 ) + $ttw; |
| 222 | $backoffs = $this->syncBackoffDeltas( $backoffs, $backoffDeltas, $wait ); |
| 223 | } |
| 224 | |
| 225 | $info = $this->executeJob( $job ); |
| 226 | |
| 227 | // Mark completed or "one shot only" jobs as resolved |
| 228 | if ( $info['status'] !== false || !$job->allowRetries() ) { |
| 229 | $this->jobQueueGroup->ack( $job ); |
| 230 | } |
| 231 | |
| 232 | // Back off of certain jobs for a while (for throttling and for errors) |
| 233 | if ( $info['status'] === false && mt_rand( 0, 49 ) == 0 ) { |
| 234 | $ttw = max( $ttw, $this->getErrorBackoffTTL( $info['caught'] ) ); |
| 235 | $backoffDeltas[$jType] = ( $backoffDeltas[$jType] ?? 0 ) + $ttw; |
| 236 | } |
| 237 | |
| 238 | $response['jobs'][] = [ |
| 239 | 'type' => $jType, |
| 240 | 'status' => ( $info['status'] === false ) ? 'failed' : 'ok', |
| 241 | 'error' => $info['error'], |
| 242 | 'time' => $info['timeMs'] |
| 243 | ]; |
| 244 | $timeMsTotal += $info['timeMs']; |
| 245 | |
| 246 | // Break out if we hit the job count or wall time limits |
| 247 | if ( $maxJobs && $jobsPopped >= $maxJobs ) { |
| 248 | $response['reached'] = 'job-limit'; |
| 249 | break; |
| 250 | } elseif ( $maxTime && ( microtime( true ) - $loopStartTime ) > $maxTime ) { |
| 251 | $response['reached'] = 'time-limit'; |
| 252 | break; |
| 253 | } |
| 254 | |
| 255 | // Stop if we caught a DBConnectionError. In theory it would be |
| 256 | // possible to explicitly reconnect, but the present behaviour |
| 257 | // is to just throw more exceptions every time something database- |
| 258 | // related is attempted. |
| 259 | if ( in_array( DBConnectionError::class, $info['caught'], true ) ) { |
| 260 | $response['reached'] = 'exception'; |
| 261 | break; |
| 262 | } |
| 263 | |
| 264 | // Don't let any of the main DB replica DBs get backed up. |
| 265 | // This only waits for so long before exiting and letting |
| 266 | // other wikis in the farm (on different masters) get a chance. |
| 267 | $timePassed = microtime( true ) - $lastSyncTime; |
| 268 | if ( $timePassed >= self::LAG_CHECK_PERIOD || $timePassed < 0 ) { |
| 269 | $opts = [ 'ifWritesSince' => $lastSyncTime, 'timeout' => self::SYNC_TIMEOUT ]; |
| 270 | if ( !$this->lbFactory->waitForReplication( $opts ) ) { |
| 271 | $response['reached'] = 'replica-lag-limit'; |
| 272 | break; |
| 273 | } |
| 274 | $lastSyncTime = microtime( true ); |
| 275 | } |
| 276 | |
| 277 | // Abort if nearing OOM to avoid erroring out in the middle of a job |
| 278 | if ( !$this->checkMemoryOK() ) { |
| 279 | $response['reached'] = 'memory-limit'; |
| 280 | break; |
| 281 | } |
| 282 | } |
| 283 | } while ( $job ); |
| 284 | |
| 285 | // Sync the persistent backoffs for the next runJobs.php pass |
| 286 | if ( $backoffDeltas ) { |
| 287 | $this->syncBackoffDeltas( $backoffs, $backoffDeltas, 'wait' ); |
| 288 | } |
| 289 | |
| 290 | $response['backoffs'] = $backoffs; |
| 291 | $response['elapsed'] = $timeMsTotal; |
| 292 | |
| 293 | return $response; |
| 294 | } |
| 295 | |
| 296 | /** |
| 297 | * Run a specific job in a manner appropriate for mass use by job dispatchers |
| 298 | * |
| 299 | * Wraps the job's run() and tearDown() methods into appropriate transaction rounds. |
| 300 | * During execution, SPI-based logging will use the ID of the HTTP request that spawned |
| 301 | * the job (instead of the current one). Large DB write transactions will be subject to |
| 302 | * $wgMaxJobDBWriteDuration. |
| 303 | * |
| 304 | * This should never be called if there are explicit transaction rounds or pending DB writes |
| 305 | * |
| 306 | * @param RunnableJob $job |
| 307 | * @return array Map of: |
| 308 | * - status: boolean; whether the job succeed |
| 309 | * - error: error string; empty if there was no error specified |
| 310 | * - caught: list of FQCNs corresponding to any exceptions caught |
| 311 | * - timeMs: float; job execution time in milliseconds |
| 312 | * @since 1.35 |
| 313 | */ |
| 314 | public function executeJob( RunnableJob $job ) { |
| 315 | $telemetry = Telemetry::getInstance(); |
| 316 | $oldRequestId = $telemetry->getRequestId(); |
| 317 | |
| 318 | if ( $job->getRequestId() !== null ) { |
| 319 | // Temporarily inherit the original ID of the web request that spawned this job |
| 320 | $telemetry->overrideRequestId( $job->getRequestId() ); |
| 321 | } else { |
| 322 | // TODO: do we need to regenerate if job doesn't have the request id? |
| 323 | // If JobRunner was called with X-Request-ID header, regeneration will generate the |
| 324 | // same value |
| 325 | $telemetry->regenerateRequestId(); |
| 326 | } |
| 327 | // Use an appropriate timeout to balance lag avoidance and job progress |
| 328 | $oldTimeout = $this->lbFactory->setDefaultReplicationWaitTimeout( self::SYNC_TIMEOUT ); |
| 329 | try { |
| 330 | return $this->doExecuteJob( $job ); |
| 331 | } finally { |
| 332 | $this->lbFactory->setDefaultReplicationWaitTimeout( $oldTimeout ); |
| 333 | $telemetry->overrideRequestId( $oldRequestId ); |
| 334 | } |
| 335 | } |
| 336 | |
| 337 | /** |
| 338 | * @param RunnableJob $job |
| 339 | * @return array Map of: |
| 340 | * - status: boolean; whether the job succeed |
| 341 | * - error: error string; empty if there was no error specified |
| 342 | * - caught: list of FQCNs corresponding to any exceptions caught |
| 343 | * - timeMs: float; job execution time in milliseconds |
| 344 | */ |
| 345 | private function doExecuteJob( RunnableJob $job ) { |
| 346 | $jType = $job->getType(); |
| 347 | $msg = $job->toString() . " STARTING"; |
| 348 | $this->logger->debug( $msg, [ 'job_type' => $job->getType() ] ); |
| 349 | $this->debugCallback( $msg ); |
| 350 | |
| 351 | // Clear out title cache data from prior snapshots |
| 352 | // (e.g. from before JobRunner was invoked in this process) |
| 353 | $this->linkCache->clear(); |
| 354 | |
| 355 | // Run the job... |
| 356 | $caught = []; |
| 357 | $rssStart = $this->getMaxRssKb(); |
| 358 | $jobStartTime = microtime( true ); |
| 359 | try { |
| 360 | $fnameTrxOwner = get_class( $job ) . '::run'; // give run() outer scope |
| 361 | // Flush any pending changes left over from an implicit transaction round |
| 362 | if ( $job->hasExecutionFlag( $job::JOB_NO_EXPLICIT_TRX_ROUND ) ) { |
| 363 | $this->lbFactory->commitPrimaryChanges( $fnameTrxOwner ); // new implicit round |
| 364 | } else { |
| 365 | $this->lbFactory->beginPrimaryChanges( $fnameTrxOwner ); // new explicit round |
| 366 | } |
| 367 | // Clear any stale REPEATABLE-READ snapshots from replica DB connections |
| 368 | $status = $job->run(); |
| 369 | $error = $job->getLastError(); |
| 370 | // Commit all pending changes from this job |
| 371 | $this->lbFactory->commitPrimaryChanges( |
| 372 | $fnameTrxOwner, |
| 373 | // Abort if any transaction was too big |
| 374 | $this->options->get( MainConfigNames::MaxJobDBWriteDuration ) |
| 375 | ); |
| 376 | // Run any deferred update tasks; doUpdates() manages transactions itself |
| 377 | DeferredUpdates::doUpdates(); |
| 378 | } catch ( Throwable $e ) { |
| 379 | MWExceptionHandler::rollbackPrimaryChangesAndLog( $e ); |
| 380 | $status = false; |
| 381 | $error = get_class( $e ) . ': ' . $e->getMessage() . ' in ' |
| 382 | . $e->getFile() . ' on line ' . $e->getLine(); |
| 383 | $caught[] = get_class( $e ); |
| 384 | } |
| 385 | // Always attempt to call teardown(), even if Job throws exception |
| 386 | try { |
| 387 | $job->tearDown( $status ); |
| 388 | } catch ( Throwable $e ) { |
| 389 | MWExceptionHandler::logException( $e ); |
| 390 | } |
| 391 | |
| 392 | $timeMs = intval( ( microtime( true ) - $jobStartTime ) * 1000 ); |
| 393 | $rssEnd = $this->getMaxRssKb(); |
| 394 | |
| 395 | // Record how long jobs wait before getting popped |
| 396 | $readyTs = $job->getReadyTimestamp(); |
| 397 | if ( $readyTs ) { |
| 398 | $pickupDelay = max( 0, $jobStartTime - $readyTs ); |
| 399 | $this->stats->timing( 'jobqueue.pickup_delay.all', 1000 * $pickupDelay ); |
| 400 | $this->stats->timing( "jobqueue.pickup_delay.$jType", 1000 * $pickupDelay ); |
| 401 | } |
| 402 | // Record root job age for jobs being run |
| 403 | $rootTimestamp = $job->getRootJobParams()['rootJobTimestamp']; |
| 404 | if ( $rootTimestamp ) { |
| 405 | $age = max( 0, $jobStartTime - (int)wfTimestamp( TS_UNIX, $rootTimestamp ) ); |
| 406 | $this->stats->timing( "jobqueue.pickup_root_age.$jType", 1000 * $age ); |
| 407 | } |
| 408 | // Track the execution time for jobs |
| 409 | $this->stats->timing( "jobqueue.run.$jType", $timeMs ); |
| 410 | // Track RSS increases for jobs (in case of memory leaks) |
| 411 | if ( $rssStart && $rssEnd ) { |
| 412 | $this->stats->updateCount( "jobqueue.rss_delta.$jType", $rssEnd - $rssStart ); |
| 413 | } |
| 414 | |
| 415 | if ( $status === false ) { |
| 416 | $msg = $job->toString() . " t={job_duration} error={job_error}"; |
| 417 | $this->logger->error( $msg, [ |
| 418 | 'job_type' => $job->getType(), |
| 419 | 'job_duration' => $timeMs, |
| 420 | 'job_error' => $error, |
| 421 | ] ); |
| 422 | |
| 423 | $msg = $job->toString() . " t=$timeMs error={$error}"; |
| 424 | $this->debugCallback( $msg ); |
| 425 | } else { |
| 426 | $msg = $job->toString() . " t={job_duration} good"; |
| 427 | $this->logger->info( $msg, [ |
| 428 | 'job_type' => $job->getType(), |
| 429 | 'job_duration' => $timeMs, |
| 430 | ] ); |
| 431 | |
| 432 | $msg = $job->toString() . " t=$timeMs good"; |
| 433 | $this->debugCallback( $msg ); |
| 434 | } |
| 435 | |
| 436 | return [ |
| 437 | 'status' => $status, |
| 438 | 'error' => $error, |
| 439 | 'caught' => $caught, |
| 440 | 'timeMs' => $timeMs |
| 441 | ]; |
| 442 | } |
| 443 | |
| 444 | /** |
| 445 | * @param string[] $caught List of FQCNs corresponding to any exceptions caught |
| 446 | * @return int TTL in seconds |
| 447 | */ |
| 448 | private function getErrorBackoffTTL( array $caught ) { |
| 449 | return in_array( DBReadOnlyError::class, $caught ) |
| 450 | ? self::READONLY_BACKOFF_TTL |
| 451 | : self::ERROR_BACKOFF_TTL; |
| 452 | } |
| 453 | |
| 454 | /** |
| 455 | * @return int|null Max memory RSS in kilobytes |
| 456 | */ |
| 457 | private function getMaxRssKb() { |
| 458 | $info = getrusage( 0 /* RUSAGE_SELF */ ); |
| 459 | // see https://linux.die.net/man/2/getrusage |
| 460 | return isset( $info['ru_maxrss'] ) ? (int)$info['ru_maxrss'] : null; |
| 461 | } |
| 462 | |
| 463 | /** |
| 464 | * @param RunnableJob $job |
| 465 | * @return int Seconds for this runner to avoid doing more jobs of this type |
| 466 | * @see $wgJobBackoffThrottling |
| 467 | */ |
| 468 | private function getBackoffTimeToWait( RunnableJob $job ) { |
| 469 | $throttling = $this->options->get( MainConfigNames::JobBackoffThrottling ); |
| 470 | |
| 471 | if ( !isset( $throttling[$job->getType()] ) || $job instanceof DuplicateJob ) { |
| 472 | return 0; // not throttled |
| 473 | } |
| 474 | |
| 475 | $itemsPerSecond = $throttling[$job->getType()]; |
| 476 | if ( $itemsPerSecond <= 0 ) { |
| 477 | return 0; // not throttled |
| 478 | } |
| 479 | |
| 480 | $seconds = 0; |
| 481 | if ( $job->workItemCount() > 0 ) { |
| 482 | $exactSeconds = $job->workItemCount() / $itemsPerSecond; |
| 483 | // use randomized rounding |
| 484 | $seconds = floor( $exactSeconds ); |
| 485 | $remainder = $exactSeconds - $seconds; |
| 486 | $seconds += ( mt_rand() / mt_getrandmax() < $remainder ) ? 1 : 0; |
| 487 | } |
| 488 | |
| 489 | return (int)$seconds; |
| 490 | } |
| 491 | |
| 492 | /** |
| 493 | * Get the previous backoff expiries from persistent storage |
| 494 | * On I/O or lock acquisition failure this returns the original $backoffs. |
| 495 | * |
| 496 | * @param array $backoffs Map of (job type => UNIX timestamp) |
| 497 | * @param string $mode Lock wait mode - "wait" or "nowait" |
| 498 | * @return array Map of (job type => backoff expiry timestamp) |
| 499 | */ |
| 500 | private function loadBackoffs( array $backoffs, $mode = 'wait' ) { |
| 501 | $file = wfTempDir() . '/mw-runJobs-backoffs.json'; |
| 502 | if ( is_file( $file ) ) { |
| 503 | $noblock = ( $mode === 'nowait' ) ? LOCK_NB : 0; |
| 504 | $handle = fopen( $file, 'rb' ); |
| 505 | if ( !flock( $handle, LOCK_SH | $noblock ) ) { |
| 506 | fclose( $handle ); |
| 507 | return $backoffs; // don't wait on lock |
| 508 | } |
| 509 | $content = stream_get_contents( $handle ); |
| 510 | flock( $handle, LOCK_UN ); |
| 511 | fclose( $handle ); |
| 512 | $ctime = microtime( true ); |
| 513 | $cBackoffs = json_decode( $content, true ) ?: []; |
| 514 | foreach ( $cBackoffs as $type => $timestamp ) { |
| 515 | if ( $timestamp < $ctime ) { |
| 516 | unset( $cBackoffs[$type] ); |
| 517 | } |
| 518 | } |
| 519 | } else { |
| 520 | $cBackoffs = []; |
| 521 | } |
| 522 | |
| 523 | return $cBackoffs; |
| 524 | } |
| 525 | |
| 526 | /** |
| 527 | * Merge the current backoff expiries from persistent storage |
| 528 | * |
| 529 | * The $deltas map is set to an empty array on success. |
| 530 | * On I/O or lock acquisition failure this returns the original $backoffs. |
| 531 | * |
| 532 | * @param array $backoffs Map of (job type => UNIX timestamp) |
| 533 | * @param array &$deltas Map of (job type => seconds) |
| 534 | * @param string $mode Lock wait mode - "wait" or "nowait" |
| 535 | * @return array The new backoffs account for $backoffs and the latest file data |
| 536 | */ |
| 537 | private function syncBackoffDeltas( array $backoffs, array &$deltas, $mode = 'wait' ) { |
| 538 | if ( !$deltas ) { |
| 539 | return $this->loadBackoffs( $backoffs, $mode ); |
| 540 | } |
| 541 | |
| 542 | $noblock = ( $mode === 'nowait' ) ? LOCK_NB : 0; |
| 543 | $file = wfTempDir() . '/mw-runJobs-backoffs.json'; |
| 544 | $handle = fopen( $file, 'wb+' ); |
| 545 | if ( !flock( $handle, LOCK_EX | $noblock ) ) { |
| 546 | fclose( $handle ); |
| 547 | return $backoffs; // don't wait on lock |
| 548 | } |
| 549 | $ctime = microtime( true ); |
| 550 | $content = stream_get_contents( $handle ); |
| 551 | $cBackoffs = json_decode( $content, true ) ?: []; |
| 552 | foreach ( $deltas as $type => $seconds ) { |
| 553 | $cBackoffs[$type] = isset( $cBackoffs[$type] ) && $cBackoffs[$type] >= $ctime |
| 554 | ? $cBackoffs[$type] + $seconds |
| 555 | : $ctime + $seconds; |
| 556 | } |
| 557 | foreach ( $cBackoffs as $type => $timestamp ) { |
| 558 | if ( $timestamp < $ctime ) { |
| 559 | unset( $cBackoffs[$type] ); |
| 560 | } |
| 561 | } |
| 562 | ftruncate( $handle, 0 ); |
| 563 | fwrite( $handle, json_encode( $cBackoffs ) ); |
| 564 | flock( $handle, LOCK_UN ); |
| 565 | fclose( $handle ); |
| 566 | |
| 567 | $deltas = []; |
| 568 | |
| 569 | return $cBackoffs; |
| 570 | } |
| 571 | |
| 572 | /** |
| 573 | * Make sure that this script is not too close to the memory usage limit. |
| 574 | * It is better to die in between jobs than OOM right in the middle of one. |
| 575 | * @return bool |
| 576 | */ |
| 577 | private function checkMemoryOK() { |
| 578 | static $maxBytes = null; |
| 579 | if ( $maxBytes === null ) { |
| 580 | $m = []; |
| 581 | if ( preg_match( '!^(\d+)(k|m|g|)$!i', ini_get( 'memory_limit' ), $m ) ) { |
| 582 | [ , $num, $unit ] = $m; |
| 583 | $conv = [ 'g' => 1073741824, 'm' => 1048576, 'k' => 1024, '' => 1 ]; |
| 584 | $maxBytes = (int)$num * $conv[strtolower( $unit )]; |
| 585 | } else { |
| 586 | $maxBytes = 0; |
| 587 | } |
| 588 | } |
| 589 | $usedBytes = memory_get_usage(); |
| 590 | if ( $maxBytes && $usedBytes >= 0.95 * $maxBytes ) { |
| 591 | $msg = "Detected excessive memory usage ({used_bytes}/{max_bytes})."; |
| 592 | $this->logger->error( $msg, [ |
| 593 | 'used_bytes' => $usedBytes, |
| 594 | 'max_bytes' => $maxBytes, |
| 595 | ] ); |
| 596 | |
| 597 | $msg = "Detected excessive memory usage ($usedBytes/$maxBytes)."; |
| 598 | $this->debugCallback( $msg ); |
| 599 | |
| 600 | return false; |
| 601 | } |
| 602 | |
| 603 | return true; |
| 604 | } |
| 605 | |
| 606 | /** |
| 607 | * Log the job message |
| 608 | * @param string $msg The message to log |
| 609 | */ |
| 610 | private function debugCallback( $msg ) { |
| 611 | if ( $this->debug ) { |
| 612 | call_user_func_array( $this->debug, [ wfTimestamp( TS_DB ) . " $msg\n" ] ); |
| 613 | } |
| 614 | } |
| 615 | } |